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Fix OOM when using large ArchiveSizeMax values

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Read from the file descriptor in 32kB chunks rather than allocating a huge
buffer upfront.
This commit is contained in:
Richard Hughes 2021-01-14 20:07:47 +00:00
parent 60441f96a5
commit 97ad335e4b
1 changed files with 24 additions and 7 deletions
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25
libfwupdplugin/fu-common.c
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@ -269,7 +269,8 @@ GBytes *
fu_common_get_contents_fd (gint fd, gsize count, GError **error)
{
#ifdef HAVE_GIO_UNIX
g_autoptr(GBytes) blob = NULL;
guint8 tmp[0x8000] = { 0x0 };
g_autoptr(GByteArray) buf = g_byte_array_new ();
g_autoptr(GError) error_local = NULL;
g_autoptr(GInputStream) stream = NULL;
@ -287,15 +288,31 @@ fu_common_get_contents_fd (gint fd, gsize count, GError **error)
/* read the entire fd to a data blob */
stream = g_unix_input_stream_new (fd, TRUE);
blob = g_input_stream_read_bytes (stream, count, NULL, &error_local);
if (blob == NULL) {
/* read from stream in 32kB chunks */
while (TRUE) {
gssize sz;
sz = g_input_stream_read (stream, tmp, sizeof(tmp), NULL, &error_local);
if (sz == 0)
break;
if (sz < 0) {
g_set_error_literal (error,
FWUPD_ERROR,
FWUPD_ERROR_INVALID_FILE,
error_local->message);
return NULL;
}
return g_steal_pointer (&blob);
g_byte_array_append (buf, tmp, sz);
if (buf->len > count) {
g_set_error (error,
FWUPD_ERROR,
FWUPD_ERROR_INVALID_FILE,
"cannot read from fd: 0x%x > 0x%x",
buf->len, (guint) count);
return NULL;
}
}
return g_byte_array_free_to_bytes (g_steal_pointer (&buf));
#else
g_set_error_literal (error,
FWUPD_ERROR,